Method for preparing cadmium compound quantum dot fluorescent thin film

Abstract

The invention belongs to a method for preparing a cadmium compound quantum dot fluorescent thin film. First prepared amphiphilic resin is used to perform cladding phase transfer treatment on an oil soluble cadmium compound quantum dot, and a water-soluble quantum dot is obtained; tetraethyl orthosilicate and a silane coupling agent are used to further perform cladding treatment on the water-soluble quantum dot, and the cadmium compound quantum dot coated with SiO2 is obtained and mixed with a resin solution to prepare the fluorescent thin film. The cadmium compound quantum dot fluorescent thin film not only has the advantage of reserving high fluorescence quantum yield of the oil soluble quantum dot, but also obviously improves stability of the quantum dot and dispersibility in the resin. The obtained fluorescent thin film is high in light transmittance, and the property not only can be applied to a backlight display technology and can also be widely applied to the field of lighting.

Description

Technical field [0001] The invention belongs to the technical field of semiconductor quantum dots, and specifically relates to a preparation method of a cadmium compound quantum dot fluorescent film. Background technique [0002] In recent years, with the rapid development of nanotechnology, semiconductor quantum dots, especially group II-VI semiconductor quantum dots, are easy to synthesize, monodisperse in size, good in color purity, high in fluorescence efficiency, and fluorescence peaks are located in the entire visible light. The advantages of continuous adjustment within the range have been used by more and more researchers in the display field and lighting field to replace the traditional rare earth phosphors. Although quantum dots can overcome the shortcomings of rare earth fluorescent pink with low purity, narrow fluorescence peak position adjustment range, and high price of rare earth metals, the application of semiconductor quantum dots is also restricted due to some s...

AI Technical Summary

Problems solved by technology

Although quantum dots can overcome the disadvantages of low purity of rare earth fluorescent pink, narrow range of fluorescence peak adjustment, and high price of rare earth metals, the application of semiconductor quantum dots is also hampered by some shortcomings in practical applications.

First of all, the quantum dots synthesized by the organic liquid phase method generally have high fluorescence efficiency and are easier to disperse in non-polar solvents. However, due to the existence of hydrophobic ligands and poor compatibility with resins, it is easy to cause agglomeration to reduce efficiency and transparency. Although the quantum dots synthesized by the aqueous phase method have better compatibility with the resin, their fluorescence quantum yield generally has a larger gap than the quantum dots synthesized by the organic liquid phase method.

In addition, semiconductor quantum dots, especially II-VI semiconductor quantum dots, contain sulfur and selenium elements, which make their photooxidation resistance and thermal stability worse. Although the core-shell structure II-VI semiconductor quantum dots have obvious stability improvement but still cannot meet the requirements of practical applications

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